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Re: [Qemu-block] [Qemu-devel] [PATCH] qemu-img: check bs_n when use old
From: |
Fam Zheng |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH] qemu-img: check bs_n when use old style option |
Date: |
Thu, 20 Apr 2017 16:11:42 +0800 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Thu, 04/20 15:59, 858585 jemmy wrote:
> On Thu, Apr 20, 2017 at 3:51 PM, Fam Zheng <address@hidden> wrote:
> > On Thu, 04/20 12:04, address@hidden wrote:
> >> From: Lidong Chen <address@hidden>
> >>
> >> When use old style option like -o backing_file, img_convert
> >> continue run when bs_n > 1, this patch fix this bug.
> >>
> >> Signed-off-by: Lidong Chen <address@hidden>
> >> ---
> >> qemu-img.c | 7 +++++++
> >> 1 file changed, 7 insertions(+)
> >>
> >> diff --git a/qemu-img.c b/qemu-img.c
> >> index b220cf7..c673aef 100644
> >> --- a/qemu-img.c
> >> +++ b/qemu-img.c
> >> @@ -2225,6 +2225,13 @@ static int img_convert(int argc, char **argv)
> >> out_baseimg = out_baseimg_param;
> >> }
> >>
> >> + if (bs_n > 1 && out_baseimg) {
> >> + error_report("-B makes no sense when concatenating multiple input
> >> "
> >> + "images");
> >> + ret = -1;
> >> + goto out;
> >> + }
> >> +
> >> /* Check if compression is supported */
> >> if (compress) {
> >> bool encryption =
> >> --
> >> 1.8.3.1
> >>
> >>
> >
> > Is this essentially the same as the check a few lines above:
> >
> > ...
> > if (bs_n < 1) {
> > error_exit("Must specify image file name");
> > }
> >
> >
> > if (bs_n > 1 && out_baseimg) {
> > error_report("-B makes no sense when concatenating multiple input "
> > "images");
> > ret = -1;
> > goto out;
> > }
> >
> > src_flags = 0;
> > ret = bdrv_parse_cache_mode(src_cache, &src_flags, &src_writethrough);
> > if (ret < 0) {
> > error_report("Invalid source cache option: %s", src_cache);
> > goto out;
> > }
> > ...
> >
> > How about moving that down?
> moving that down is ok.
> but will exit later if use -B option.
> which way do you think better?
Exiting later is not a problem, I assume? And it's better to avoid duplicating
code if possible.
BTW if you do that way, it's better to "s/-B/Specifying backing image/" in the
error message (to be compatible with -o backing_file syntax).
Fam